Siemens SIMATIC PCS 7 Function Manual

Table of contents
1 Security information......................................................................................................................................7
2 Preface.........................................................................................................................................................9
3 Basics of high availability............................................................................................................................15
3.1 Motivation for using high availability process control systems...............................................15
3.2 Plant-wide availability considerations.....................................................................................18
3.3 PCS 7 redundancy concept...................................................................................................19
3.3.1 Advantages of the PCS 7 redundancy concept ....................................................................19
3.3.2 PCS 7 redundancy concept 1 (fieldbus based on PROFIBUS DP) ......................................20
3.3.3 PCS 7 redundancy concept 2 (fieldbus based on PROFINET IO) ........................................22
3.4 Features of the PCS 7 redundancy concept at a glance........................................................24
3.5 Features for the configuration phase.....................................................................................26
3.6 Features for the commissioning and operation phases.........................................................27
3.7 Features for servicing and system expansions......................................................................29
3.8 Definition of availability...........................................................................................................30
3.9 Definition of the standby modes.............................................................................................31
3.10 Redundancy nodes................................................................................................................32
4 High availability solutions in PCS 7............................................................................................................35
4.1 Solutions for the I/O...............................................................................................................35
4.1.1 Redundant I/O........................................................................................................................38
4.1.2 Switched I/O...........................................................................................................................42
4.1.3 Components in the distributed I/O..........................................................................................45
4.1.3.1 Redundant interface modules in distributed I/O.....................................................................45
4.1.3.2 Redundant I/O modules.........................................................................................................46
4.1.3.3 Redundant actuators and sensors.........................................................................................48
4.2 Solutions for automation systems..........................................................................................50
4.2.1 Hardware components of the S7-400H..................................................................................50
4.2.2 How the SIMATIC S7-400H AS operates..............................................................................53
4.3 Solutions for communication..................................................................................................54
4.3.1 Network components.............................................................................................................56
4.3.2 Media Redundancy Protocol..................................................................................................59
4.3.3 Solutions for the terminal bus.................................................................................................61
4.3.3.1 Connecting PC stations to the terminal bus...........................................................................61
4.3.3.2 High availability terminal bus..................................................................................................61
4.3.3.3 Redundant, high availability terminal bus...............................................................................63
4.3.3.4 Redundant, high availability terminal bus based on the Parallel Redundancy Protocol
(PRP).....................................................................................................................................64
4.3.4 Solutions for the plant bus......................................................................................................68
4.3.4.1 Connecting PC stations to the plant bus................................................................................68
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 3

Siemens SIMATIC PCS 7 Specifications

General

Brand	Siemens
Model	SIMATIC PCS 7
Category	Control Systems
Language	English